There is nothing that suggests this isn't the same person.
In the face, I agree with you, they are remarkably similar, even the eyebrows.
However, Nicky's hair is a lighter brown - that photo shows him with darker hair but another has traces of blond in it, and another German-language site gives his height as 1.78m (5'10"), so quite a bit shorter than Lyle was measured at. That doesn't necessarily mean a rule-out but he's less strong as a candidate for a match than he might otherwise have been.